Tunnel kiln



F. DRESSLER TUNNEL HILN 2 Shee5-5heet c): n q) Ave/wie L &

Aug. 26, 1924. i V E506,573

P.DRE5SLR TUNNEL KILN Filed Jan. 22 1919 2 Sheets-Sheet 2 m /5 yf M MA' @Mo/mam Patented Aug.I 26, 1924.

UNITED STATES PHILIP DRESSLER, F ZANESVILLE, OHIO,

PATENT OFFICE.

ASSIGNOR TO AMERICAN DRESSLER TUN- NEL KILNS, INC., 0F NEW YORK, N. Y., A CORPORATION 0F NEW YORK.

TUNNEL KILN.

Application filed January 22, 1919. Serial No. 272,420.

To all whom t may concer/n:

Be it known that I, PHILIP DREssLER, a

subject of the Kingdom of Great Britain,

residing at Zanesville, in the county of Muskingum, State of Ohio, have invented certain new and useful Improvements in Tunnel Kilns, of which the following is a specification.

My improvement relates to tunnel kilns of the muiiie type as generally.. described in S. Letters Patent granted to C. Dressler, No. 1,170,428 dated Feb. 1, 1916. In the type of kiln disclosed in said patent, the gas is introduced into the combustion chambers at the temperature of the atmosphere, or

slightly above the temperature of the atmosphere, While the air used in combustion with the gas is introduced directly from the goods chamber at a hi h temperature. To obtain the best results, 1t is desirable that both the gas and air should be heated to a ln' h temperature before they are introduced 1nto the combustion chambers.

The object of my invention, therefore, is a construction by means of which both gas and air may be pre-heated before being introduced into the combustion chambers, and distributed as desired at different portions of the chambers.

The accompanying drawings will serve to illustrate my inventlon, in which:

Fig. 1 is a horizontal section and partial lan, illustratin a construction in which th the gas an air are heated external to the combustion chambers before being introduced into the combustion chambers.

Fig. 2 is a vertical section taken substantially on the line II-II of Fig. 1.

Flg. 3 is a horizontal section and partial plan illustrating a modification of the construction shown'in Fig. 1.

Fig. 4 is a vertical section taken substantially on the line IV-IV of Fig. 3.

F1g. 5 is a horizontal section and partial plan showin a modification of the construction shown 1n Fig. 3.

Fig. 6 is a horizontal section and partial plan showing a further modification of the construction shown in .Fi 3.

In the drawings, 5 indlcates a ln'ln structure. 6, combustion chambers arranged on each side of the interior `of the structure. In construction, the combustion chambers are substantially the same as described in w Y prior patent of Dressler, to which reference has above been made. Arranged on one side of the kiln, is a gas heating chamber 7, and on the opposite side, an air heating chamber 8. Arranged in these chambers are a series of flues 9, the construction of the chambers being substantially the same. Gas is fed to the gas heating chamber through a pipe 10 and air to the air heating chamber through a pipe 11. Heated gas is conveyed from the gas heating chamber 7 to the combustion chambers 6, through a ipe 12, and the air from the air heatln bustion chambers 6 t ough a pipe 13. The space surrounding the iues 9 in gas heating chamber 7, is connected to one of the combustion chambers 6 through a pipe 14, and the similar space in air heating chamber 8 Ito one of the combustion chambers 6 through a pipe 15.y The spaces inthe heating chambers 7 and 8 surrounding the iues 9, are connected to chimney iiues 16.

The operation of the construction so far as described is as follows: Gas entering through the pi e 10 and air through the pipe 11, pass t ugh the lues 9 and respectively through the pipes 12 and 13 into the combustion chambers 6. The outgoing products of combustion from the combus` tion chambers pass through pipes 14 and 15 to the space surrounding the ues 9, thereby heating the gas and air, and pass out throu h the chimney ilues 16.

Re erring now to Fig. 3. In this figure, the combustion chambers are divided into two sections, 6, at the right of the figure, which corresponds to that shown in Fig. 1, and 6 at the left of the figure. The

c amber to the comcombustion chambers 6l are provided with extensions 6", which extensions are ex osed to the temperature of the interioro the ln'ln, and are therefore heated. The extensions 6b are carried through the walls of the kiln and are open as shown at 6. The air used in combustion in the combustion chambers 6a, enters through the opening 6, is heated' in passing through the extension 6", and is brought in contact, in the combustion chambers, with the heated as derived from the gas heatingl chamber The arrangement of arts, so far as the chambers 6 are concern ,at the right of the figure, is the same as in Fig. 1.

Referring now to Fig. 5. The construction shown in this ligure is the same as in Fig. 3, with the exception that the combustion chambers 6 at the right hand side of the figure are not provided with the tubular extensions 6d, as shown in 'Figs 1 and E2. The tubular extensions 6d are shown in Figs. 1 and 2 as connected to a pipe 17, by means of which the products of combustion passing vthrough the extensions 6r1 may be carried through gas heating chamber 7 and thence tothe chimney flues 16, as shown in Fig. 6. It will be noted'that in Figs. 1, 3 and 6, the combustion chambers 6 are provided with exit pipes 14 and 15, and their extensions 6d with exit pipe 17 through both of which the roductsof combustion may be conveyed to the gas and air heating chambers '7 ard 8, and thence to the chimney lues 16, the pur of this arrangement being to provide that only a portion of the products of combustion shall pass through the extensions 64 and thereby insure that the temperature at the right hand end of the kiln, i. e., the exit end, shall be lower than over that portion of the kiln occupied by the chambers 6. In Fig. 6, the gas fed to the chambers 6a is heated by the products of combustion derived from the extensions 6d ofthe chambers 6, which pass through pipe 17 .chamber 7 and chimney iiue 16. Gas heatexi by passage through pipes 9 of chamber 7, passes through pipe 12a to the orward end of the chambers 6a Where it mingles with heated air which passes from the interior of thei furnace through the open end 18 of the chambers 6. The temperature of the products of combustion so derived, is necessarily lower than that derived from the chambers 6 and 6", and the purpose of this arrangement is to rovide that the temperature. at the entrance end of the kiln, i. e., the left hand end, shall be lower than the temperature at the center of the kiln. It will be observed from this figure, that the gas and, the air fed to the chambers 6 are heated by the outgoing products of combustion from chambers 6 vassing through pipes 14*l and 15, and also irom chambers 6 passing through pipes 14 and "il all f I 15, whichinsures the highest temperature in the chambers 6.

I wish it understood that the various constructions shown in the different figures, are merely illustrative of such as may be used to pre-heat gas and air and to distribute preheated gas and air at different temperatures to different sections along the length of the kiln, and that various changes may be made Without in any Wise departing from the intent of my invention.

Having thus described my invention, claim:

1. In a tunnel kiln the combination of heating means therefor comprising internal combustion chambers, means for supplying fluid material to said chambers to maintain combustion therein and means comprising a plurality of outlets from said combustion chambers for regulably preheating said material by products of combustion Withdrawn from said chambers..

2. In a tunnel kiln the combination of heating means therefor comprising internal combustion chambers having outlets through which products of combustion may be Withdrawn from said chambers at different ternperatures and means for supplying gaseous material to said combustion chambers to maintain combustion therein including provisions external to the kiln for regulably preheating said 'material' by products of combustion Withdrawn from the combustion chambers through said outlets.

3. In a tunnel kiln and in combination with combustion chambers located on each side of the interior of the kiln, means for pre-heating the gas and air used inl such combustion chambers, said means consisting of chambers throughwhich the gas and air arefed and heated, the gas by the Waste pmdnctspof combustion from .the body of a combustion chamber, and the air from an extension of the'combustion chamber.

t In testimony whereof, I atlix my signaure.

PHILIP yDRESSLER. 

